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<a name="Dump-setup-1"></a>
<h4 class="subsection">9.7.1 Dump setup</h4>
<a name="index-dump-setup"></a>

<p>A dump_manager class is defined in <samp>dumpfile.h</samp>. Various passes
register dumping pass-specific information via <code>dump_register</code> in
<samp>passes.cc</samp>. During the registration, an optimization pass can
select its optimization group (see <a href="Optimization-groups.html#Optimization-groups">Optimization groups</a>). After
that optimization information corresponding to the entire group
(presumably from multiple passes) can be output via command-line
switches. Note that if a pass does not fit into any of the pre-defined
groups, it can select <code>OPTGROUP_NONE</code>.
</p>
<p>Note that in general, a pass need not know its dump output file name,
whether certain flags are enabled, etc. However, for legacy reasons,
passes could also call <code>dump_begin</code> which returns a stream in
case the particular pass has optimization dumps enabled. A pass could
call <code>dump_end</code> when the dump has ended. These methods should go
away once all the passes are converted to use the new dump
infrastructure.
</p>
<p>The recommended way to setup the dump output is via <code>dump_start</code>
and <code>dump_end</code>.
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